Comparison analysis of microbial agent and different compost material on microbial community and nitrogen transformation genes dynamic changes during pig manure compost

Liu, Naiyuan; Liu, Zhuangzhuang; Wang, Keyu; Zhao, Jinfeng; Fang, Jun; Liu, Gang; Yao, Hao; Pan, Junting

doi:10.1016/j.biortech.2024.130359

Cited by 6 publications

(1 citation statement)

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“…Pseudomethylobacillus , Luteimonas, Chryseotalea, and Longimicrobium appeared as the dominant genera at the gate level in the soil remediated with a 2% dosage of LDH/BC, where Pseudomethylobacillus and Chryseotalea increased the average relative abundance from 0.0038% and 0% to 16.47% and 6.8%, respectively, and it has been reported that both of them are found in freshwater water and their occurrence in the soil may imply the improvement in the soil environment [ 46 , 47 ]. Based on previous reports [ 48 ], Luteimonas is one of the core genera in composting that promotes the process of nitrogen transformation and thus reduces nitrogen loss, indicating that an increase in the average relative abundance of Luteimonas from 0.0004% to 6.80% is beneficial for improving the nitrogen fixation capacity of the soil. The average relative abundance of Longimicrobium increased from 0% to 2.14%, and available studies have shown that Longimicrobium can promote plant tolerance to heavy metal and salt stress, nutrient uptake, and plant growth [ 49 ].…”

Section: Resultsmentioning

confidence: 98%

CaAl-Layered Double Hydroxides-Modified Biochar Composites Mitigate the Toxic Effects of Cu and Pb in Soil on Pea Seedlings

Wang,

Cai,

et al. 2024

Materials

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Compound contamination of soil with heavy metals copper (Cu) and lead (Pb) triggered by mining development has become a serious problem. To solve this problem, in this paper, corncob kernel, which is widely available and inexpensive, was used as the raw material of biochar and modified by loading CaAl-layered double hydroxides to synthesize biochar-loaded CaAl-layered double hydroxide composites (CaAl-LDH/BC). After soil remediation experiments, either BC or CaAl-LDH/BC can increase soil pH, and the available phosphorus content and available potassium content in soil. Compared with BC, CaAl-LDH/BC significantly reduced the available content of Cu and Pb in the active state (diethylenetriaminepentaacetic acid extractable state) in the soil, and the passivation rate of Cu and Pb by a 2% dosage of CaAl-LDH/BC reached 47.85% and 37.9%, respectively. CaAl-LDH/BC can significantly enhance the relative abundance of beneficial microorganisms such as Actinobacteriota, Gemmatimonadota, and Luteimonas in the soil, which can help to enhance the tolerance and reduce the enrichment ability of plants to heavy metals. In addition, it was demonstrated by pea seedling (Pisum sativum L.) growing experiments that CaAl-LDH/BC increased plant fresh weight, root length, plant height, catalase (CAT) activity, and protein content, which promoted the growth of the plant. Compared with BC, CaAl-LDH/BC significantly reduced the Cu and Pb contents in pea seedlings, in which the Cu and Pb contents in pea seedlings were reduced from 31.97 mg/kg and 74.40 mg/kg to 2.92 mg/kg and 6.67 mg/kg, respectively, after a 2% dosage of CaAl-LDH/BC, which was a reduction of 90.84% and 91.03%, respectively. In conclusion, compared with BC, CaAl-LDH/BC improved soil fertility and thus the plant growth environment, and also more effectively reduced the mobility of heavy metals Cu and Pb in the soil to reduce the enrichment of Cu and Pb by plants.

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